The efficiency of a surface for eollecting and holding the fallout material is important. It is not surprising thatthe highest dose rate readings as vell as biological effects were noted on the hair of the natives and also on parts ef the exposed body where perspiration was present. Further, it was observed that ever ene layer of light ectton material was sufficient to protect against beta akin damage in rost eases®. This was éne probably not to the relatively anall attenuation of the betas by the @othing but rather to the physical situation of holding the radioactive material at sone distance from the akin, which effect would be relatively large. An added eonsideration is the possibility of high beta doses delivered to persomel fron the felbut-material lying on the ground end © other surfaces. this If the highest degree of contarination considered under policy is aafe when in direct eontact with the skin, then the beta dose fron an equally contaminated ground will mt be hasardous. Folicy III for discussion on unequal contanination on personel.) (See However, it is true that the contanination may exceed the azount to deliver dose rates given in table II and yet not be great enough to consider evacuetion, Some personnel say not go indoors snd those who did will eventually be released from this restrictive action and then nay walk around in 4 relatively highly contaninated area. Because of the more linited range - of the beta, the location ef greatest concern is the lover legs. One report estimates a beta to gamma dose rate ratio of about 75 to 1 at 10 centinsters above the ground.## Under Folicy I it was recon ® ITk-923. ifte ##.5~95() § ; Radi 60 from Fission Froducts, 1949 (UNCLASSIFICD) é : € ; e Cronkite, E. P., ot al. i et oger to Hay 1954. a Garre Radie Condit, R.I., Dyson, J.F. and Lluxb, W.A.S, NRDL ae.- zy a4